EP0192962A1 - Idling return device for internal combustion engines - Google Patents
Idling return device for internal combustion engines Download PDFInfo
- Publication number
- EP0192962A1 EP0192962A1 EP86100847A EP86100847A EP0192962A1 EP 0192962 A1 EP0192962 A1 EP 0192962A1 EP 86100847 A EP86100847 A EP 86100847A EP 86100847 A EP86100847 A EP 86100847A EP 0192962 A1 EP0192962 A1 EP 0192962A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- throttle valve
- idling
- spring
- internal combustion
- operating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/12—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with non-fuel substances or with anti-knock agents, e.g. with anti-knock fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M3/00—Idling devices for carburettors
- F02M3/02—Preventing flow of idling fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
- F02M19/12—External control gear, e.g. having dash-pots
Definitions
- the present invention relates to an idling return device for internal combustion engines, more particularly to an idling return device with a throttle body of a carburetor or a mutipoint injection apparatus for internal combustion engines or to an idling return device for a throttle body for liquefied petroleum gas (LPG) internal combustion engines.
- the throttle body provides a throttle valve therein being impelled by a return spring so as to be closed to an idling degree of opening.
- a conventional idling return device for internal combustion engines comprises a throttle body, a throttle valve provided within the throttle body, and a return, spring for returning the throttle valve forcibly.
- the return spring consists of-a throttle valve return mechanism.
- the conventional throttle valve is formed, in such a manner that it is opened and, closed in accordance with the accelerator pedal depressing force.
- the throttle valve having a throttle valve return mechanism consisted of the return spring is formed in such a manner that the throttle valve returns in the closing direction toward an idling degree of opening owing to the tensile force of the return spring when the application of the accelerator pedal depressing force is stopped.
- An object of the present invention is to provide an idling return device for internal combustion engines wherein a throttle valve can be reliably closed to an idling degree of opening even when a return spring, which is provided for impelling the throttle valve so as to close the throttle valve when the application of an accelerator pedal depressing force is stopped, is broken or damaged.
- Still object of the present invention is to provide an idling return device for internal combustion engines wherein an idle return mechanism can be closed a throttle valve to an idling degree of opening by the vacuum force occuring at the downstream side of the throttle valve when the application of an accelerator pedal stepping force is stopped.
- Stillmore object of the present invention is to provide an idling return device for internal combustion engines wherein an idling return mechanism can be closed a throttle valve to an idling degree of opening by the electromagnetic force when the application of an accelerator pedal depressing force is stopped.
- the present invention is directed to an idling return device for internal combustion engines, having a throttle valve which is formed so that the throttle valve is impelled so as to be closed to an idling degree of opening by a return spring, so that the throttle valve is opened against the tensile force of the return spring when an accelerator is depressed, and so that the throttle valve controls the flow rate of air or a gaseous mixture of air and a fuel, characterized in that the idling return device is provided with an idling return mechanism for automatically closing the. throttle valve to the idling degree of opening when .the throttle valve is displaced in the closing direction by the return spring to a position which is slightly before the position corresponding to the idling degree of opening.
- the idling return device of the present invention comprises a conventional throttle valve return mechanism consisted of the return spring and further comprises above the idling return mechanism.
- the idli-ng return mechanism of the present invention comprises a toggle joint of a diaphragm utilizing a suction vacuum of an engine, or an electromanetic force member, and which is adapted to be operated only when the engine is decelerated-, and not when the engine is accelerated.
- the idling return device for internal combustion engines is capable of reliably closing the throttle valve to an idling degree of opening even when the return spring, which is provided for urging the throttle valve so as to close the throttle valve when the application of an accelerator pedal depressing force is stopped, is broken or damaged, and for improing the safety of the vehicle.
- Fig. 1 is a plane view of an embodiment of an idling return device
- Fig. 2 is a sectional view of the embodiment in an idling state
- Fig. 3 is a sectional view of the embodiment with a throttle valve opened during the acceleration of the engine
- Fig. 4 is a sectional view of the embodiment in which a vacuum on the downstream side of the throttle valve is applied to a vacuum chamber by the idling return mechanism to drive a diaphragm.
- An air valve body or throttle body 1 has a suction passage 2 therein.
- a throttle valve 4 is provided in the air valve body 1 with a throttl valve shaft 3.
- the throttle valve shaft 3 passes through the air valve body 1 and mounts on a return spring 30 surrounding the throttle valve shaft 3 in one end thereof, which is the conventional throttle valve return mechanism.
- the throttle valve 4 returns in the closing direction toward an idling degree of opening owing to the tensile force of the return spring 30 when the application of an accelerator pedal depressing force is stopped.
- the throttle valve 4 controls flow rate of air or a gaseous mixture of air and a fuel.
- the idling degree of opening is generally at an angle of about less 1° for a throttle body of the multipoint injection apparatus for internal combustion engines and is generally at an angle of about 1-3° for a throttle body of the carburetor for internal combustion engines.
- a lever 5 is fixed at the other end of the throttle valve shaft 3 and is turned to around the throttle valve shaft 3.
- the lever 5 is fixed with one end of an operating rod 14 of an idling return mechanism 16A to the free end portion thereof.
- a suction vacuum discharge port 7 is provided in a portion 6.of the suction passage 2.
- the suction vacuum discharge port 7 is communicated on the downstream side of the throttle valve 4.
- a vacuum passage 8 is communicated at one end thereof with the suction vacuum discharge port 7.
- the vacuum passage 8 is communicated at the other end thereof with a vacuum chamber 9 in a case 18.
- the vacuum passage 8 provides an orifice 17 at the intermediate portion thereof.
- a diaphragm 11 divides the interior of the case 18 into the vacuum chamber 9 and an atmospheric chamber 20 which is communicated with the atmospheric air.
- the diaphragm 11 is urged within the vacuum chamber 9 toward the atmospheric chamber 20 by a.diaphragm spring 10.
- a below stopper 12 is fixed to the diaphragm 11.
- the below stopper 12 has a free end 12a thereof.
- the free end 12a of the below stopper 12 contacts to the inner surface of the case 18.
- An operating member 13 is fixed at its end to the portion of the diaphragm 11 in the atmospheric chamber 20.
- the operating member 13 is made of single plate and is formed in a L letter sectional shape.
- the operating member 13 may be made of a cylindrical tube etc.
- an operating rod 14 is fixed through an operating spring 15 to the inside of the other end portion of the operating member 13 so that the operating rod 14 is drawn into the interior of the operating member 13.
- a locking portion or locking member 14a of the operating rod 14 engageable with a stopper 13a of the operating member 13 fixed to the inner end surface of the operating member 13 is formed on a longitudinally intermediate section of the operating rod 14.
- the section of the locking portion 14a of the operating rod 14 is within the operating member 13 while the throttle valve 4 is closed. Namely, the locking portion 14a of the operating rod 14 is formed on the section shown in Fig. 2 of the operating rod 14.
- the idling return mechanism 16A consists of the case 18 having the vacuum chamber 9 and the atmospheric chamber 20, the vacuum chamber 9 is communicated through the vacuum passage 8 with the portion 6 of the suction passage 2 being on the downstream side of the throttle valve 4 . separated from the atmospheric chamber 20 by the diaphragm 11 and provided with the diaphragm spring 10 therein, the diaphragm 11 is impelled toward the atmospheric chamber 20 by the diaphragm spring 10 the atmospheric chamber 20 is communicated with the atmospheric air; the operating member 13 fixed at one end portion thereof to the diaphragm 11 within the atmospheric chamber 20 and provided in the interior of the other end portion thereof with the operating rod 14 so that the operating rod 14 is fixed at one end thereof through the operating spring 15 the inside of the second-mentioned end portion of the operating member 13 in such a manner that the operating rod 14 is drawn into the interior of the operating member 13; the lever 5 fixed at the end portion thereof around which the lever 5 is turned the throttle valve shaft 3 of the throttle valve 4, the lever 5 is fixed at the other
- the idling return device of this embodiment of the present invention is provided with the idling return mechanism 16A for automatically closing the throttle valve 4 to the idling degree of opening when the throttle valve 4 is displaced in the closing direction by the return spring 30 to a position which is slightly before the position corresponding to the idling degree of opening.
- the throttle valve 4 is formed so that it is opened when an accelerator pedal is depressed, and closed to the idling degree of opening owing to the tensile force of the return spring 30 when the foot is removed from the accelerator pedal.
- Fig. 2 shows this embodiment of the present invention in an idling operation.
- a vacuum in the portion of the suction passage 2 which is on the downstream side of the throttle valve 4 is introduced from the suction vacuum discharge port 7 into the vacuum chamber 9 in the idling return mechanism 16A through the vacuum passage 8, and the diaphragm 11 overcomes the tensile force of the diaphragm spring 10 to draw the operating member 13 thereto.
- the throttle valve 4 is closed to the idling degree of opening, and the vacuum . at the downstream side of the throttle valve 4 becomes low.
- the diaphragm 11 is impelled by the diaphragm spring 10, and the free end 12a of the below stopper 12 engages the inner surface of the atmospheric chamber 20 with the operating spring 15 in an extended state.
- the diaphragm spring 10 When the suction vacuum in the portion of the suction passage 2 is lower than a predetermined level during an idling operation, the diaphragm spring 10 is not operated as shown by a curve A in Fig. 6 in which the lateral and longitudinal axes represent the manifold vacuum and the operational condition of the diaphragm 11, respectively.
- the operating spring 15 is formed so as to have a tensile force less than that of the return spring 30 by which the throttle valve 4 is returned when the application of the accelerator pedal depressing force is stopped.
- the locking portion 14a of the operating rod 14 and the stopper 13a of the operating member 13 are spaced apart from each other.
- the operating spring 15 is also adapted to absorb the vibration occurring between the operating member 13 and the operating rod 14.
- Fig. 3 shows this embodiment in an accelerated state.
- the suction vacuum is lower than a set level (in this case about 520-530mm Hg) shown in Fig. 6.
- the diaphragm 11 in the idling return mechanism 16A is not operated, and the operating rod 14 alone is moved in accordance with the movement of the lever 5 as it compresses a part of the operating spring 15. During this time, the locking portion 14a of the operating rod 14 does not contact to the stopper 13a of the operating member 13.
- this embodiment requires a slightly larger force as compared with the conventional device of this kind, to press the operating spring 15 when the accelerator pedal is stepped, and the remaining part of the operation of this embodiment is not different from that of the conventional device. During this time, the idling return mechanism 16A is not in operation.
- Fig. 4 shows this embodiment which has just begun to decelerate. Due to deceleration, the suction vacuum in the portion of the suction passage 2 becomes high enough to cause the vacuum in the vacuum chamber 9 to increase to a high level, and the diaphragm 11 overcomes the tensile force of the diaphragm spring 10, so that the diaphragm 11 moves back with the operating member 13.
- the throttle valve 4 mounted 'on the throttle valve shaft 3 can be returned forcibly by the idling return mechanism 16A even when the throttle valve 4 does not receive the sufficient resilient force to return the throttle valve 4 to an idling degree of opening from the return spring 30 which is adapted to return the throttle valve 4 when the application of an accelerator pedal depressing force is stopped or when the return spring 30 is damaged.
- the idling return mechanism' l6A is adapted to be operated by a vacuum occurring when the engine is decelerated. Accordingly, the idling. return mechanism 16A can be operated forcibly for at least several seconds while the suction vacuum is higher than a set level (in this case about 520-530mm Hg), as shown by a curve B in Fig. 6 in which the lateral and longitudinal axes represent the time and manifold vacuum, respectively.
- a set level in this case about 520-530mm Hg
- the orifice 17 is provided at the intermediate portion of the vacuum passage 8. This enables the time of operation to be lengthened.
- This idling return mechanism 16A can be applied to a throttle body of carburetor or a throttle body of a multipoint injection apparatus of an internal combustion engine, or a throttle body of a LPG internal engine.
- This idling return machanism 16A is capable of closing the throttle valve 4 to the idling degree of opening by the tensile force of the diaphragm spring 10 and the operating spring 15 even when the suction vacuum is not introduced thereinto.
- this embodiment of the idling return device for internal combustion engines having the idling return mechanism 16A is capable of closing the throttle valve 4 to the idling degree of opening by the suction vacuum force occurring at the downstream side of the throttle valve 4, when the application of an accelerator pedal depressing force is stopped.
- Figs. 7 and 8 show further embodiments of the present invention.
- a high suction vacuum at the downstream side of the throttle valve 4 is detected to operate the idling return mechanism 16A.
- the throttle valve 4 is closed to an idling degree of opening by the electromagnetic force when the throttle valve 4 is moved to a position slightly before a position corresponding to the idling degree of opening.
- the embodiment shown in Fig. 7 is an embodiment utilizing an electromagnet means consisting of an electromagnetic force member.
- an electromagnet means 23 consisting of an electromagnetic force member is disposed in a position to which an end portion 21a of a throttle lever 21 is opposed. And when the application of an accelerator pedal depressing force . is stopped, an idling return mechanism 16B is turned on and off automatically by utilizing the force of the electromagnet means 23.
- the time for turning on and off the electromagnet means 23 is controlled through a computer 22 in accordance with the condition of the engine which is detected by a gear switch, an engine rotating switch, a vacuum sensor and an acceleration sensor etc.
- the electromagnet means 23 attracts the throttle lever 21 with a large force, especially, when the engine requires to be accelerated, the driver cannot move the vehicle in a desired manner. Such an inconvenience can be eliminated easily by controlling the electromagnet means 23 through the computer 22.
- the idling return mechanism 16B comprises the throttle lever 21 mounted on the throttle valve shaft 3 of the throttle valve 4, the electromagnet means 23 being disposed oppositely in the end portion 21a of the throttle lever 21, and the computer 22 for controlling the time for turning on and off the force of the electromagnet means 23.
- Fig. 8 shows an embodiment utilizing a solenoid valve 25 consisting of an electromagnetic force member.
- the solenoid valve 25 is provided in a similar manner as the electromagnet means 23 in the embodiment shown in Fig. 7 and adapted to be controlled through a computer 26 when the engine is decelerated with the application of the accelerator pedal depressing force stopped.
- an idling return mechanism 16C comprises a throttle lever 24 mounted on the throttle valve shaft 3 of the throttle valve 4, the solenoid valve 25 connected to the throttle lever 24, and the computer 26 for controlling the time for turning on and off the force of the solenoid valve 25.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
- The present invention relates to an idling return device for internal combustion engines, more particularly to an idling return device with a throttle body of a carburetor or a mutipoint injection apparatus for internal combustion engines or to an idling return device for a throttle body for liquefied petroleum gas (LPG) internal combustion engines. The throttle body provides a throttle valve therein being impelled by a return spring so as to be closed to an idling degree of opening. (Description of the Prior Art)
- As disclosed in the specification of Japanese Utility Model Publication No. 2663/1982, a conventional idling return device for internal combustion engines comprises a throttle body, a throttle valve provided within the throttle body, and a return, spring for returning the throttle valve forcibly. The return spring consists of-a throttle valve return mechanism.
- The conventional throttle valve is formed, in such a manner that it is opened and, closed in accordance with the accelerator pedal depressing force. Namely, the throttle valve having a throttle valve return mechanism consisted of the return spring is formed in such a manner that the throttle valve returns in the closing direction toward an idling degree of opening owing to the tensile force of the return spring when the application of the accelerator pedal depressing force is stopped.
- However, when the return spring in a mechanism for returning the throttle valve forcibly by the return spring is bent, the number of revolutions per minute of the engine becomes greater than a predetermined number in some cases even if the driver stops depressing the accelerator pedal. This would cause difficulty for the driver. Therefore, there has been a demand for a device for reliably closing the throttle valve when the driver stops depressing the accelerator pedal as a safety means.
- An object of the present invention is to provide an idling return device for internal combustion engines wherein a throttle valve can be reliably closed to an idling degree of opening even when a return spring, which is provided for impelling the throttle valve so as to close the throttle valve when the application of an accelerator pedal depressing force is stopped, is broken or damaged.
- Another object of the present invention is to provide an idling return device for internal combustion engines wherein a throttle valve can be returned forcibly by an idling return mechanism even when the throttle valve does not receive a sufficient resilient force to return the throttle valve to an idling degree of opening from a return spring which is adapted to return the throttle valve when the application of an accelerator pedal depressing force is stopped. Further object of the present invention is to provide an idling return device for internal combustion engines wherein an idling'return mechanism can be adapted to be operate only when the engine is decelerated.
- Still object of the present invention is to provide an idling return device for internal combustion engines wherein an idle return mechanism can be closed a throttle valve to an idling degree of opening by the vacuum force occuring at the downstream side of the throttle valve when the application of an accelerator pedal stepping force is stopped.
- Stillmore object of the present invention is to provide an idling return device for internal combustion engines wherein an idling return mechanism can be closed a throttle valve to an idling degree of opening by the electromagnetic force when the application of an accelerator pedal depressing force is stopped.
- The present invention is directed to an idling return device for internal combustion engines, having a throttle valve which is formed so that the throttle valve is impelled so as to be closed to an idling degree of opening by a return spring, so that the throttle valve is opened against the tensile force of the return spring when an accelerator is depressed, and so that the throttle valve controls the flow rate of air or a gaseous mixture of air and a fuel, characterized in that the idling return device is provided with an idling return mechanism for automatically closing the. throttle valve to the idling degree of opening when .the throttle valve is displaced in the closing direction by the return spring to a position which is slightly before the position corresponding to the idling degree of opening.
- The idling return device of the present invention comprises a conventional throttle valve return mechanism consisted of the return spring and further comprises above the idling return mechanism.
- The idli-ng return mechanism of the present invention comprises a toggle joint of a diaphragm utilizing a suction vacuum of an engine, or an electromanetic force member, and which is adapted to be operated only when the engine is decelerated-, and not when the engine is accelerated.
- The idling return device for internal combustion engines according to the present invention is capable of reliably closing the throttle valve to an idling degree of opening even when the return spring, which is provided for urging the throttle valve so as to close the throttle valve when the application of an accelerator pedal depressing force is stopped, is broken or damaged, and for improing the safety of the vehicle.
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- Fig. 1 is a plane view of an embodiment of an idling return device for internal combustion engines having an idling return mechanism according to the present inention;
- Fig. 2 is a sectional view of an embodiment of the idling return device for internal combustion engines taken a line II-II of Fig. 1, in which the idling return mechanism has begun idling;
- Fig. 3 is a sectional view' of the idling return device for internal combustion engines of Fig. 2 during the acceleration of the engine with the throttle valve opened;
- Fig. 4 is a sectional view of the idling return device for internal combustion engines of Fig. 2, in which the idling return mechanism is operated by vacuum pressure;
- Fig. 5 is a diagram illustrating a manifold vacuum with respect to the lapse of time during an operation of the idling return mechanism for internal combustion engines;
- Fig. 6 is a diagram illustrating the relation between a manifold vacuum and the condition of an operation of the diaphragm in the idling return mechanism for internal combustion engines;
- Fig. 7 illustrates another embodiment of the idling return device for internal combustion engines having an idling return mechanism according to the present invention; and
- Fig. 8 illustrates further embodiment of the idling return device for internal combustion engines having an idling return mechanism according to the present invention.
- Detailded Description of the Preferred Embodiments:
- An idling return device for internal combustion engines having an idling return mechanism according to the present invention will now be described with reference to its embodiment of Figs. 1-4.
- Fig. 1 is a plane view of an embodiment of an idling return device, Fig. 2 is a sectional view of the embodiment in an idling state, Fig. 3 is a sectional view of the embodiment with a throttle valve opened during the acceleration of the engine, and Fig. 4 is a sectional view of the embodiment in which a vacuum on the downstream side of the throttle valve is applied to a vacuum chamber by the idling return mechanism to drive a diaphragm.
- An air valve body or throttle body 1 has a
suction passage 2 therein. Athrottle valve 4 is provided in the air valve body 1 with athrottl valve shaft 3. Thethrottle valve shaft 3 passes through the air valve body 1 and mounts on areturn spring 30 surrounding thethrottle valve shaft 3 in one end thereof, which is the conventional throttle valve return mechanism. - The
throttle valve 4 returns in the closing direction toward an idling degree of opening owing to the tensile force of thereturn spring 30 when the application of an accelerator pedal depressing force is stopped. Thethrottle valve 4 controls flow rate of air or a gaseous mixture of air and a fuel. - The idling degree of opening is generally at an angle of about less 1° for a throttle body of the multipoint injection apparatus for internal combustion engines and is generally at an angle of about 1-3° for a throttle body of the carburetor for internal combustion engines.
- A
lever 5 is fixed at the other end of thethrottle valve shaft 3 and is turned to around thethrottle valve shaft 3. Thelever 5 is fixed with one end of anoperating rod 14 of anidling return mechanism 16A to the free end portion thereof. - A suction
vacuum discharge port 7 is provided in a portion 6.of thesuction passage 2. The suctionvacuum discharge port 7 is communicated on the downstream side of thethrottle valve 4. - A
vacuum passage 8 is communicated at one end thereof with the suctionvacuum discharge port 7. Thevacuum passage 8 is communicated at the other end thereof with avacuum chamber 9 in acase 18. Thevacuum passage 8 provides anorifice 17 at the intermediate portion thereof. - A diaphragm 11 divides the interior of the
case 18 into thevacuum chamber 9 and anatmospheric chamber 20 which is communicated with the atmospheric air. The diaphragm 11 is urged within thevacuum chamber 9 toward theatmospheric chamber 20 by a.diaphragm spring 10. - A
below stopper 12 is fixed to the diaphragm 11. The belowstopper 12 has a free end 12a thereof. The free end 12a of the below stopper 12 contacts to the inner surface of thecase 18. - An
operating member 13 is fixed at its end to the portion of the diaphragm 11 in theatmospheric chamber 20. Theoperating member 13 is made of single plate and is formed in a L letter sectional shape. Theoperating member 13 may be made of a cylindrical tube etc. - The inner end of an
operating rod 14 is fixed through anoperating spring 15 to the inside of the other end portion of theoperating member 13 so that theoperating rod 14 is drawn into the interior of theoperating member 13. - A locking portion or locking member 14a of the
operating rod 14 engageable with astopper 13a of theoperating member 13 fixed to the inner end surface of the operatingmember 13 is formed on a longitudinally intermediate section of theoperating rod 14. The section of the locking portion 14a of theoperating rod 14 is within theoperating member 13 while thethrottle valve 4 is closed. Namely, the locking portion 14a of theoperating rod 14 is formed on the section shown in Fig. 2 of theoperating rod 14. - In this embodiment, the
idling return mechanism 16A consists of thecase 18 having thevacuum chamber 9 and theatmospheric chamber 20, thevacuum chamber 9 is communicated through thevacuum passage 8 with theportion 6 of thesuction passage 2 being on the downstream side of thethrottle valve 4. separated from theatmospheric chamber 20 by the diaphragm 11 and provided with thediaphragm spring 10 therein, the diaphragm 11 is impelled toward theatmospheric chamber 20 by thediaphragm spring 10 theatmospheric chamber 20 is communicated with the atmospheric air; theoperating member 13 fixed at one end portion thereof to the diaphragm 11 within theatmospheric chamber 20 and provided in the interior of the other end portion thereof with theoperating rod 14 so that theoperating rod 14 is fixed at one end thereof through theoperating spring 15 the inside of the second-mentioned end portion of theoperating member 13 in such a manner that theoperating rod 14 is drawn into the interior of theoperating member 13; thelever 5 fixed at the end portion thereof around which thelever 5 is turned thethrottle valve shaft 3 of thethrottle valve 4, thelever 5 is fixed at the other end portion thereof to the end portion of theoperating rod 14 which projects from theoperating member 13; and the locking member 14a provided on theoperating rod 14 and adapted to engage thestopper 13a, thestopper 13a is fixed to such an inner side of theoperating member 13 that is on the side of thelever 5, when theoperating rod 14 is displaced in the throttle valve-opening direction, and when theoperating rod 14 is displaced toward thecase 18, to cause theoperating spring 15 to be compressed. - The idling return device of this embodiment of the present invention is provided with the
idling return mechanism 16A for automatically closing thethrottle valve 4 to the idling degree of opening when thethrottle valve 4 is displaced in the closing direction by thereturn spring 30 to a position which is slightly before the position corresponding to the idling degree of opening. - The
throttle valve 4 is formed so that it is opened when an accelerator pedal is depressed, and closed to the idling degree of opening owing to the tensile force of thereturn spring 30 when the foot is removed from the accelerator pedal. - Fig. 2 shows this embodiment of the present invention in an idling operation. In order to put the embodiment in an idling state, a vacuum in the portion of the
suction passage 2 which is on the downstream side of thethrottle valve 4 is introduced from the suctionvacuum discharge port 7 into thevacuum chamber 9 in theidling return mechanism 16A through thevacuum passage 8, and the diaphragm 11 overcomes the tensile force of thediaphragm spring 10 to draw theoperating member 13 thereto. - Accordingly, the
throttle valve 4 is closed to the idling degree of opening, and the vacuum . at the downstream side of thethrottle valve 4 becomes low. The diaphragm 11 is impelled by thediaphragm spring 10, and the free end 12a of thebelow stopper 12 engages the inner surface of theatmospheric chamber 20 with the operatingspring 15 in an extended state. - When the suction vacuum in the portion of the
suction passage 2 is lower than a predetermined level during an idling operation, thediaphragm spring 10 is not operated as shown by a curve A in Fig. 6 in which the lateral and longitudinal axes represent the manifold vacuum and the operational condition of the diaphragm 11, respectively. - The operating
spring 15 is formed so as to have a tensile force less than that of thereturn spring 30 by which thethrottle valve 4 is returned when the application of the accelerator pedal depressing force is stopped. The locking portion 14a of the operatingrod 14 and thestopper 13a of the operatingmember 13 are spaced apart from each other. The operatingspring 15 is also adapted to absorb the vibration occurring between the operatingmember 13 and the operatingrod 14. - Fig. 3 shows this embodiment in an accelerated state. When the embodiment is in this condition the suction vacuum is lower than a set level (in this case about 520-530mm Hg) shown in Fig. 6.
- Accordingly, the diaphragm 11 in the idling
return mechanism 16A is not operated, and the operatingrod 14 alone is moved in accordance with the movement of thelever 5 as it compresses a part of the operatingspring 15. During this time, the locking portion 14a of the operatingrod 14 does not contact to thestopper 13a of the operatingmember 13. - While the engine is accelerated, this embodiment requires a slightly larger force as compared with the conventional device of this kind, to press the operating
spring 15 when the accelerator pedal is stepped, and the remaining part of the operation of this embodiment is not different from that of the conventional device. During this time, the idlingreturn mechanism 16A is not in operation. - Fig. 4 shows this embodiment which has just begun to decelerate. Due to deceleration, the suction vacuum in the portion of the
suction passage 2 becomes high enough to cause the vacuum in thevacuum chamber 9 to increase to a high level, and the diaphragm 11 overcomes the tensile force of thediaphragm spring 10, so that the diaphragm 11 moves back with the operatingmember 13. - Consequently, the operating
spring 15 is compressed, and the locking portion 14a of the operatingrod 14 engages with thestopper 13a of the operatingmember 13. The operatingrod 14 is drawn into the operatingmember 13, so that thethrottle valve 4 is closed to an idling degree of opening. - Therefore, the
throttle valve 4 mounted 'on thethrottle valve shaft 3 can be returned forcibly by the idlingreturn mechanism 16A even when thethrottle valve 4 does not receive the sufficient resilient force to return thethrottle valve 4 to an idling degree of opening from thereturn spring 30 which is adapted to return thethrottle valve 4 when the application of an accelerator pedal depressing force is stopped or when thereturn spring 30 is damaged. - The idling return mechanism' l6A is adapted to be operated by a vacuum occurring when the engine is decelerated. Accordingly, the idling. return
mechanism 16A can be operated forcibly for at least several seconds while the suction vacuum is higher than a set level (in this case about 520-530mm Hg), as shown by a curve B in Fig. 6 in which the lateral and longitudinal axes represent the time and manifold vacuum, respectively. - In order to control the time of operation, the
orifice 17 is provided at the intermediate portion of thevacuum passage 8. This enables the time of operation to be lengthened. - This idling
return mechanism 16A can be applied to a throttle body of carburetor or a throttle body of a multipoint injection apparatus of an internal combustion engine, or a throttle body of a LPG internal engine. - This idling
return machanism 16A is capable of closing thethrottle valve 4 to the idling degree of opening by the tensile force of thediaphragm spring 10 and the operatingspring 15 even when the suction vacuum is not introduced thereinto. - As described above, this embodiment of the idling return device for internal combustion engines having the idling
return mechanism 16A is capable of closing thethrottle valve 4 to the idling degree of opening by the suction vacuum force occurring at the downstream side of thethrottle valve 4, when the application of an accelerator pedal depressing force is stopped. - Therefore, even when the
return spring 30, which is provided so as to impel thethrottle valve 4 so that thethrottle valve 4 is closed when the application of an accelerator pedal depressing force is stopped, is broken or damaged. This enables the safety of the vehicle to be improved. - Figs. 7 and 8 show further embodiments of the present invention. In the previously-described embodiment, a high suction vacuum at the downstream side of the
throttle valve 4 is detected to operate the idlingreturn mechanism 16A. While in both of the embodiments of Figs. 7 and 8 thethrottle valve 4 is closed to an idling degree of opening by the electromagnetic force when thethrottle valve 4 is moved to a position slightly before a position corresponding to the idling degree of opening. - The embodiment shown in Fig. 7 is an embodiment utilizing an electromagnet means consisting of an electromagnetic force member. In this embodiment, an electromagnet means 23 consisting of an electromagnetic force member is disposed in a position to which an
end portion 21a of a throttle lever 21 is opposed. And when the application of an accelerator pedal depressing force . is stopped, an idlingreturn mechanism 16B is turned on and off automatically by utilizing the force of the electromagnet means 23. - The time for turning on and off the electromagnet means 23 is controlled through a
computer 22 in accordance with the condition of the engine which is detected by a gear switch, an engine rotating switch, a vacuum sensor and an acceleration sensor etc. - If the electromagnet means 23 attracts the throttle lever 21 with a large force, especially, when the engine requires to be accelerated, the driver cannot move the vehicle in a desired manner. Such an inconvenience can be eliminated easily by controlling the electromagnet means 23 through the
computer 22. - In this embodiment, the idling
return mechanism 16B comprises the throttle lever 21 mounted on thethrottle valve shaft 3 of thethrottle valve 4, the electromagnet means 23 being disposed oppositely in theend portion 21a of the throttle lever 21, and thecomputer 22 for controlling the time for turning on and off the force of the electromagnet means 23. - Fig. 8 shows an embodiment utilizing a
solenoid valve 25 consisting of an electromagnetic force member. Thesolenoid valve 25 is provided in a similar manner as the electromagnet means 23 in the embodiment shown in Fig. 7 and adapted to be controlled through acomputer 26 when the engine is decelerated with the application of the accelerator pedal depressing force stopped. - In this embodiment, an idling
return mechanism 16C comprises athrottle lever 24 mounted on thethrottle valve shaft 3 of thethrottle valve 4, thesolenoid valve 25 connected to thethrottle lever 24, and thecomputer 26 for controlling the time for turning on and off the force of thesolenoid valve 25. - The above two embodiments of the present invention having the idling
return mechanisms electromagnetic force member return mechanism 16A utilizing the toggle joint of the diaphragm using the suction vacuum of the engine shown in Figs. 1-4.
Claims (7)
said idling return device is provided with an idling return mechanism (16A; 16B; - 16C) for automatically closing the throttle valve (4) to the idling degree of opening when the throttle valve (4) is displaced in the closing direction by the return spring (30) to a position which is slightly before the position corresponding to the idling degree of opening.
said idling return mechanism (16A) consists of a case (18) having a vacuum chamber (9).and an atmospheric chamber (20), said vacuum chamber (9) is communicated through a vacuum passage (8) with a portion (6) of a suction passage (2) being on the downstrem side of the throttle valve (4) separated from said atmospheric chamber (20) by a diaphragm (11) and provided with a diaphragm spring (10) therein, said diaphragm (11) is impelled toward said atmospheric chamber (20) by said diaphragm spring (10), said atmospheric chamber (20) is communicated with the atmospheric air; an operating member (13) fixed at one end portion thereof to said diaphragm (11) within said atmospheric chamber (20) and provided in the interior of the other end portion thereof with an operating rod (14) so that said operating rod (14) is fixed at one end thereof through an operating spring (15) to the inside of the second-mentioned end portion of said operating member (13) in such a manner that said operating rod (14) is drawn into the interior of said operating member (13); a lever (5) fixed at the end portion thereof around which said lever (5) is turned to a throttle valve shaft (3) of the throttle valve (4), said lever (5) is fixed at the other end portion thereof to the end portion of said operating rod (14) which projects from said operating member (13); and a locking member (14a) provided on said operating rod (14) and adapted to engage a stopper (13a), said stopper (13a) is fixed to such an inner side of said operating member (13) that is on the side of said lever (5), when said . operating rod (14) is displaced in the throttle valve-opening direction, and when said operating rod (14) is displaced toward said case (18), to cause said operating spring (15) to be compressed.
the tensile force of said operating spring (15) is set to a level which is high enough to close the throttle valve (4) to the acceleration degree of opening when the engine is stopped, and which is lower than a level of the tensile force of the return spring (30) by which the throttle valve (4) is closed when the application of the accelerator pedal depressing force is stopped.
an orifice (17) is provided at an intermediate portion of said vacuum passage (8) so as to lengthen the time of operation.
said idling return mechanism (16B; 16C) is formed of an electromagnetic force member (23; 25) so as to close the throttle valve (4) to the idling degree of opening when a throttle valve shaft (3) of the throttle valve (4) is turned from the position in which the throttle valve (4) is opened to a position slightly before the position of the idling degree of opening.
said idling return mechanism (16B) comprises a throttle lever (21) mounted on a throttle valve shaft (3) of the throttle valve (4), an electromagnet means (23) being disposed oppositely in an end portion (21a) of said throttle lever (21), and a computer (22) for controlling the time' for turning on and off the force of said electromagnet means (23).
said idling return mechanism (16C) comprises a throttle lever (24) mounted on a throttle valve shaft (3) of the throttle valve (4), a solenoid valve (25) connected to said throttle lever (24), and a computer (26) for controlling the time for turning on and off the force of said solenoid valve (25).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13018/85 | 1985-01-25 | ||
JP60013018A JPS61171836A (en) | 1985-01-25 | 1985-01-25 | Idle return apparatus for internal-combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0192962A1 true EP0192962A1 (en) | 1986-09-03 |
EP0192962B1 EP0192962B1 (en) | 1989-04-05 |
Family
ID=11821406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86100847A Expired EP0192962B1 (en) | 1985-01-25 | 1986-01-23 | Idling return device for internal combustion engines |
Country Status (5)
Country | Link |
---|---|
US (1) | US4660518A (en) |
EP (1) | EP0192962B1 (en) |
JP (1) | JPS61171836A (en) |
KR (1) | KR900000144B1 (en) |
DE (1) | DE3662714D1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0322785A2 (en) * | 1987-12-29 | 1989-07-05 | Siemens Aktiengesellschaft | Pedal return arrangement |
EP0418484A1 (en) * | 1989-09-19 | 1991-03-27 | Mercedes-Benz Ag | Intake manifold throttling valve driving device for a diesel engine |
FR2766875A1 (en) * | 1997-07-29 | 1999-02-05 | Dellorto Spa | I.c. engine carburettor with valve and vacuum=controlled membrane |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3840465A1 (en) * | 1988-12-01 | 1990-06-07 | Vdo Schindling | ELECTROPNEUMATIC ADJUSTING DEVICE FOR A THROTTLE VALVE OF AN INTERNAL COMBUSTION ENGINE |
US4991552A (en) * | 1989-04-03 | 1991-02-12 | Vdo Adolf Schindling Ag | Throttle valve setting device |
US6302089B1 (en) * | 1999-05-20 | 2001-10-16 | Caterpillar Inc. | Method and apparatus for controlling a rotatable shaft |
US6971369B1 (en) * | 2004-11-03 | 2005-12-06 | Briggs & Stratton Corporation | Pressure assisted governor |
US8915231B2 (en) | 2010-03-16 | 2014-12-23 | Briggs & Stratton Corporation | Engine speed control system |
US8726882B2 (en) | 2010-03-16 | 2014-05-20 | Briggs & Stratton Corporation | Engine speed control system |
US9316175B2 (en) | 2010-03-16 | 2016-04-19 | Briggs & Stratton Corporation | Variable venturi and zero droop vacuum assist |
US8910616B2 (en) | 2011-04-21 | 2014-12-16 | Briggs & Stratton Corporation | Carburetor system for outdoor power equipment |
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FR787421A (en) * | 1934-03-15 | 1935-09-23 | Device for controlling the operation of carburettors in internal combustion engines | |
US3830213A (en) * | 1972-02-24 | 1974-08-20 | Colt Ind Operating Corp | Throttle return spring redundancy system |
FR2269642A1 (en) * | 1974-04-30 | 1975-11-28 | Falorni Alexandre | Fuel enconomiser and engine brake - has fuel supply butterfly valve closed at end of accelerator pedal travel |
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US3645241A (en) * | 1970-04-16 | 1972-02-29 | Gen Motors Corp | Bistable throttle control system |
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FR2459373A1 (en) * | 1979-06-19 | 1981-01-09 | Renault | METHOD OF REDUCING THE EMISSION OF HARMFUL GAS FROM A CARBURETTOR INTERNAL COMBUSTION ENGINE DURING DECELERATION PERIOD AND APPARATUS USING THE SAME |
JPS5947591B2 (en) * | 1980-06-07 | 1984-11-20 | 森永乳業株式会社 | How to make egg tofu |
JPS59196940A (en) * | 1983-04-21 | 1984-11-08 | Toyota Motor Corp | Intake-air controlling apparatus for internal-combustion engine used in vehicle |
JPS6098133A (en) * | 1983-11-02 | 1985-06-01 | Hitachi Ltd | Throttle valve open/close controller |
JPS6176729A (en) * | 1984-09-21 | 1986-04-19 | Nissan Motor Co Ltd | Throttle valve control device of internal-combustion engine |
-
1985
- 1985-01-25 JP JP60013018A patent/JPS61171836A/en active Granted
-
1986
- 1986-01-23 DE DE8686100847T patent/DE3662714D1/en not_active Expired
- 1986-01-23 EP EP86100847A patent/EP0192962B1/en not_active Expired
- 1986-01-25 KR KR1019860000479A patent/KR900000144B1/en not_active IP Right Cessation
- 1986-01-27 US US06/823,019 patent/US4660518A/en not_active Expired - Fee Related
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FR787421A (en) * | 1934-03-15 | 1935-09-23 | Device for controlling the operation of carburettors in internal combustion engines | |
US3830213A (en) * | 1972-02-24 | 1974-08-20 | Colt Ind Operating Corp | Throttle return spring redundancy system |
FR2269642A1 (en) * | 1974-04-30 | 1975-11-28 | Falorni Alexandre | Fuel enconomiser and engine brake - has fuel supply butterfly valve closed at end of accelerator pedal travel |
US4355611A (en) * | 1979-07-19 | 1982-10-26 | Toyota Jidosha Kogyo Kabushiki Kaisha | Throttle linkage system in an automobile provided with an internal combustion engine |
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PATENTS ABSTRACTS OF JAPAN, vol. 9, no. 63 (M-365) [1786], 20th March 1985; & JP-A-59 196 940 (TOYOTA JIDOSHA K.K.) 08-11-1984 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0322785A2 (en) * | 1987-12-29 | 1989-07-05 | Siemens Aktiengesellschaft | Pedal return arrangement |
EP0322785A3 (en) * | 1987-12-29 | 1990-02-14 | Siemens Aktiengesellschaft | Pedal return arrangement |
EP0418484A1 (en) * | 1989-09-19 | 1991-03-27 | Mercedes-Benz Ag | Intake manifold throttling valve driving device for a diesel engine |
US5065719A (en) * | 1989-09-19 | 1991-11-19 | Mercedes-Benz Ag | Actuating device for a throttle valve arranged in an intake pipe of a diesel internal combustion engine |
FR2766875A1 (en) * | 1997-07-29 | 1999-02-05 | Dellorto Spa | I.c. engine carburettor with valve and vacuum=controlled membrane |
Also Published As
Publication number | Publication date |
---|---|
JPH0336140B2 (en) | 1991-05-30 |
DE3662714D1 (en) | 1989-05-11 |
US4660518A (en) | 1987-04-28 |
JPS61171836A (en) | 1986-08-02 |
KR900000144B1 (en) | 1990-01-20 |
EP0192962B1 (en) | 1989-04-05 |
KR860005962A (en) | 1986-08-16 |
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